- Nov 23, 2015
Hi, couple of weeks ago have faced a problem that our fresh Haas VF2SS(2019) breaks taps on "small" treads like metric M2 and M2.5 in aluminum (6061, 2024) (it's something like UNC 2-56). Does anyone else also have such issue? Honestly, do not where should i look to find the solution: the hole is straight (i mean has no deviation in direcction, not it's sexuality), no chip inside, feeds and speeds are OK and we cut using them for the last couple of years until the problem occured. Pecking also won't help. I thought that there is a problem in material properties (maybe it wasn't heat treated properly) and tried thread formers but they also break on these threads...